| /* Copyright (C) 1996-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <bits/libc-lock.h> |
| #include <shadow.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| |
| /* A reasonable size for a buffer to start with. */ |
| #define BUFLEN_SPWD 1024 |
| |
| /* We need to protect the dynamic buffer handling. */ |
| __libc_lock_define_initialized (static, lock); |
| |
| libc_freeres_ptr (static char *buffer); |
| |
| /* Read one shadow entry from the given stream. */ |
| struct spwd * |
| fgetspent (FILE *stream) |
| { |
| static size_t buffer_size; |
| static struct spwd resbuf; |
| fpos_t pos; |
| struct spwd *result; |
| int save; |
| |
| if (fgetpos (stream, &pos) != 0) |
| return NULL; |
| |
| /* Get lock. */ |
| __libc_lock_lock (lock); |
| |
| /* Allocate buffer if not yet available. */ |
| if (buffer == NULL) |
| { |
| buffer_size = BUFLEN_SPWD; |
| buffer = malloc (buffer_size); |
| } |
| |
| while (buffer != NULL |
| && (__fgetspent_r (stream, &resbuf, buffer, buffer_size, &result) |
| == ERANGE)) |
| { |
| char *new_buf; |
| buffer_size += BUFLEN_SPWD; |
| new_buf = realloc (buffer, buffer_size); |
| if (new_buf == NULL) |
| { |
| /* We are out of memory. Free the current buffer so that the |
| process gets a chance for a normal termination. */ |
| save = errno; |
| free (buffer); |
| __set_errno (save); |
| } |
| buffer = new_buf; |
| |
| /* Reset the stream. */ |
| if (fsetpos (stream, &pos) != 0) |
| buffer = NULL; |
| } |
| |
| if (buffer == NULL) |
| result = NULL; |
| |
| /* Release lock. Preserve error value. */ |
| save = errno; |
| __libc_lock_unlock (lock); |
| __set_errno (save); |
| |
| return result; |
| } |